Do a web search , I thought I read that you just need to paint or cover the pvc because it attaches the plastic film if left on for a long time . I use pvc hoops over my raised bed for the winter and haven't had any issues but I take it off most of the year

Hope not building NOW! Cold makes PVC snap easy when smaller sizes used. Think I wold go up some in size if mine. I hate plastic sheeting and tarps for anything one wishes to last. I laugh when I see ads for those One-car plastic garages and bet they won't last 1/2 a winter as sold.

I made a frame out of a trampoline frame; a half circle on each side with the leg sockets connected by 2x2s. I anchored the whole thing with rebar and covered it with a tarp and bungee cords. A strong wind lifted it 10 ft. in the air and sent it flying.

I am planning on building a frame work for bird netting out of PVC to protect the hascap and sea buckthorn bushes next year. Hadn't thought about using rebar to anchor it. Thanks for the tip. Since it will not be solid walled plastic I won't have to worry about the wind taking it away, but I do wonder about the PVC and sun damage. Should be fairly easy to take down if it looks like the pipe is deteriorating after a while though.

I'm putting up a used Shelter Logic tent garage. The PO had it up for 16 years. It is still in fair condition. I hope to fit 15 GTs or other toys into it for the winter. I will be tying the frame down to the tractors in atleast 12 places. I will also throw 3 lines over it and ty them down so that the tarp cannot billow up and rip.

It uses 11/2" steel pipe and even it bent a little under last winters' snow. Good Luck, Rick

Mine isn't that big its about 12' or 15' long 7' wide 3/4" pvc. Needs to be covered but is pretty sturdy right now. I have heard about pvc touching the film but have seen peoples that have been up a while and they have pvc touching the film.

We built a 12' X 24' greenhouse out of PVC, we used 1 inch pvc on 4' tall walls with dirt piled against them. You will half to cover the PVC pipe with something, if not, after one season the greenhouse plastic will fall apart. Ours has withstood 80mph winds and it didn't phase it. We have used this for 2 seasons and it has worked great.

Since your greenhouse is going to be that big, I would recommend using 1 1/2" pvc